首先是MainActivity.java部分：

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package com.qrcode;
 
 
import com.google.zxing.WriterException;
import com.zxing.activity.CaptureActivity;
import com.zxing.encoding.EncodingHandler;
 
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
    private TextView resultTextView;
    private EditText qrStrEditText;
    private ImageView qrImgImageView;
     
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         
        resultTextView = (TextView) this.findViewById(R.id.tv_scan_result);
        qrStrEditText = (EditText) this.findViewById(R.id.et_qr_string);
        qrImgImageView = (ImageView) this.findViewById(R.id.iv_qr_image);
         
        Button scanBarCodeButton = (Button) this.findViewById(R.id.btn_scan_barcode);
        scanBarCodeButton.setOnClickListener(new OnClickListener() {
             
            @Override
            public void onClick(View v) {
                     
                Intent openCameraIntent = new Intent(MainActivity.this,CaptureActivity.class);
                startActivityForResult(openCameraIntent, 0);
            }
        });
         
        Button generateQRCodeButton = (Button) this.findViewById(R.id.btn_add_qrcode);
        generateQRCodeButton.setOnClickListener(new OnClickListener() {
             
            @Override
            public void onClick(View v) {
                try {
                    String contentString = qrStrEditText.getText().toString();
                    if (!contentString.equals("")) {
                         
                        Bitmap qrCodeBitmap = EncodingHandler.createQRCode(contentString, 350);
                        qrImgImageView.setImageBitmap(qrCodeBitmap);
                    }else {
                        Toast.makeText(MainActivity.this, "Text can not be empty", Toast.LENGTH_SHORT).show();
                    }
                     
                } catch (WriterException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
     
        if (resultCode == RESULT_OK) {
            Bundle bundle = data.getExtras();
            String scanResult = bundle.getString("result");
            resultTextView.setText(scanResult);
        }
    }
}

    下面就是构成拍摄页面的部分由于很多都是继承的代码，这里我就不粘贴了，给大家一个图看一下，下面放出整理后的代码。

    最后别忘了给权限部分：

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.qrcode"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="7" />
     
    <uses-permission android:name="android.permission.VIBRATE" />  <!-- 震动权限 -->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />        <!-- 使用照相机权限 -->
    <uses-feature android:name="android.hardware.camera.autofocus" />   <!-- 自动聚焦权限 -->
 
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         
        <!-- 隐藏键盘 --><!-- 全屏 -->
        <activity
            android:configChanges="orientation|keyboardHidden"    
            android:name="com.zxing.activity.CaptureActivity"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"    
            android:windowSoftInputMode="stateAlwaysHidden" >
        </activity>
 
    </application>
</manifest>

    效果图：

Android第七期 - 二维码扫描与生成图

Android第七期 - 二维码扫描与生成图

Android第七期 - 二维码扫描与生成图